Formation of metal nanostructures under X-ray radiation in films of interpolyelectrolyte complexes with different silver
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Formation of metal nanostructures under X-ray radiation in films of interpolyelectrolyte complexes with different silver ion content* K. V. Mkrtchyan,a A. A. Zezin,a,b E. A. Zezina,b S. S. Abramchuk,c and I. A. Baranovab aN.
S. Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 70 ul. Profsoyuznaya, 117393 Moscow, Russian Federation bDepartment of Chemistry, Lomonosov Moscow State University, Build. 11, 1 Leninskie Gory, 119991 Moscow, Russian Federation. E-mail: [email protected] cA. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 119334 Moscow, Russian Federation The specific features of the formation of metal nanoparticles under X-ray radiation in interpolyelectrolyte complex (IPEC) films based on polyacrylic acid and polyethyleneimine with different silver ion content were studied. IPEC films were irradiated in aqueous-alcoholic medium. Electron microscopy demonstrated that the formation of silver nanoparticles occurred in zones regularly located by film thickness. It was found that nanoparticle size and spatial distribution in IPEC films depended on the initial concentration of silver ions within the sample and on the absorbed dose of radiation. The obtained film nanocomposites are promising objects for application as antibacterial and catalytic materials. Key words: interpolyelectrolyte complexes, polyacrylic acid, polyethyleneimine, radiationchemical reduction, silver nanoparticles, metal polymer nanocomposites.
Over the past several decades, much attention has been paid to the development of methods for obtaining metal polymer nanocomposites in polymer films and coatings.1—5 Materials containing silver nanoparticles serve as the basis for a wide range of functional devices, have applications in medicine, optoelectronics, and nanophotonics, and are used for the development of sensors and biosensors.5—12 General method of synthesis of metal polymer nanocomposites is the reduction of metal ions in polymer systems.1—4,7—15 Matrices based on polyelectrolytes are widely used as precursors for the synthesis of metal polymer hybrid materials,1,2,5,10 because they effectively stabilize the forming nanoparticles. The possibility of tuning the binding of metal ions and the interaction of macromolecules with the nanoparticle surface suggests the use of interpolyelectrolyte complexes (IPECs) as a polymer base for the synthesis of nanocomposites.1—5,9,13—20 Radiation-chemical approaches provide considerable advancement both in obtaining chemically "pure" nanoparticles with a controlled size, and in studying the formation of nanoparticles at different stages.4,5,9,11,12,19—24 Radiation-chemical approaches were widely used for the synthesis of copper, nickel, gold, silver nanoparticles, as well as bimetallic nanoparticles in films and coatings of
complexes based on polyacrylic acid—polyethyleneimine (PAA—PEI).4,5,9,13,19,20,25—27 The properties of nanocomposite materials depend on the size of nanoparticles and their spatial distribution within
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